Direct answer: how MT4 vs MT5 works in forex
MT4 and MT5 are client platforms used to view price information, build trading decisions (manually or via automation), and send trade requests to a broker’s trading server. In forex, the platform does not “trade the market” by itself; it formats orders, communicates with the server, and then displays the results the server reports (such as order acceptance, fills, and account changes). The main difference for users is not that one platform magically produces better forex outcomes, but that they organize features, automation tools, and data handling differently.
Mechanics and definitions: what happens from click to fill
A useful way to understand both platforms is as a three-part loop: (1) market data flow, (2) decision and order creation, and (3) execution feedback.
1) Market data flow
- The platform shows charts using price updates it receives from the broker’s infrastructure.
- Those updates can include bid/ask quotes and derived fields such as candles.
- The chart you see and the prices used for order requests are influenced by the data feed the broker provides and your platform’s settings.
2) Decision and order creation
- A user can create orders through the interface, or an automated strategy can generate requests based on rules.
- The platform packages the request with parameters such as symbol, order type (for example, market or pending), volume, and price-related fields when required.
- For automation, the platform repeatedly runs the strategy logic at times determined by ticks, timers, and/or events.
3) Execution feedback
- The broker’s server validates the request according to trading conditions and rules.
- The server then responds with outcomes such as acceptance, rejection, or a filled execution.
- The platform updates your open positions, order history, and account metrics based on the server’s replies.
In other words, “MT4 vs MT5” is best viewed as differences in the client-side experience and tooling, while the broker’s server, trading conditions, and execution rules strongly influence the observed result.
Inputs and outputs: what each platform consumes and reports
Inputs you should distinguish
- Price inputs: live quotes and chart data the platform receives.
- Strategy inputs: rules coded in the platform’s automation language (or user-driven inputs for manual trading).
- Order inputs: symbol selection, order type, volume, and any price constraints.
- Environment inputs: connection quality, platform settings, and the broker server’s policies.
Outputs you should interpret carefully
- Order state changes: submitted, accepted, rejected, partially filled, or filled.
- Trade fills and position data: average price, remaining volume, and position status.
- Account history: realized results, commissions/fees, and balance/equity changes.
- Logs and reports: records that help you confirm what the platform asked for versus what the server did.
A key independent-verification idea is to compare the platform’s “request” details (what parameters it sent) with the “execution” details (what the server actually reported).
Evidence and comparison without guarantees: concrete example sequence
Consider the same conceptual workflow in both MT4 and MT5:
- You observe a forex price move on a chart.
- Your logic (manual or automated) decides to place an order.
- The platform sends an order request to the server.
- The server applies execution conditions (such as whether the requested price is still available, how quickly it can match, and any costs).
- The platform displays the confirmed order status and resulting position.
Even if both platforms show similar candles and you trigger the same conceptual rule, the final fills can differ due to:
- Timing differences (a decision made on one tick versus the next)
- Quote spread changes between decision and execution
- Connection delays
- Broker-side constraints like margin checks and allowed order parameters
This is why platform comparison should focus on measurable behavior (messages, fills, logs), not on implied performance.
Limitations and failure modes: where things can break or mislead
1) Market-data mismatch
The chart can be based on data updates that arrive with timing and formatting differences. A strategy may trigger on one view of price but request an order using a different moment’s quote.
2) Execution differences
Order acceptance does not guarantee a particular fill price. Market liquidity, the broker’s execution method, and short-term quote availability can change what the server returns.
3) Automation assumptions
Automated strategies can behave differently depending on how often they receive tick updates, how timers fire, and how events are handled. Code may also assume a certain order lifecycle that does not match reality.
4) Platform and configuration settings
Common examples include handling of slippage tolerance, display of prices, and how pending orders are tracked. Incorrect or misunderstood settings can lead to confusion when reading history.
5) Provider and jurisdiction variability
Trading conditions, data quality, and server-side rules vary by broker and region. Without checking the specific environment, it is not safe to generalize.
Verification: how to independently confirm MT4 vs MT5 behavior
- Use a demo environment to test the full workflow: chart update → strategy/manual trigger → order request → server response → account history update.
- Record the exact order parameters you intended (symbol, order type, volume, and price constraints).
- After execution, compare: (a) what the platform reported as the request and (b) what the server reported as fills.
- Review logs and order history entries for rejected or partially filled orders; treat those as evidence about platform-client and server-execution differences.
- Repeat tests under different volatility and connection-quality conditions to see how sensitive behavior is to timing and costs.
If you can explain your observations in terms of “inputs → requests → server validation → outputs,” you can accurately describe how MT4 vs MT5 works in forex for your specific setup without assuming any guaranteed outcome.